Abstract: A composite material tube with inlaid element, on the outer periphery of the inlaid element are provided with a plurality of ribs which are to be engaged with a plurality of grooves in the composite tube, through the engagement of the ribs with the grooves, external-force-induced rotation of the inlaid element relative to the composite material tube can be eliminated. On the periphery of the inlaid element is further formed an annular groove for engaging with a projection of the composite material tube, through the engagement of the projection with the recess, an external-force-induced axial disengagement of the inlaid element from the composite material tube can be prevented.

Abstract: A double action brake handle structure is provided which includes a cam surface on a brake handle and a roller mounted on a brake cable retainer. The cam surface bears on the roller upon actuation of the brake handle in order to give the brake cable greater movement so that the brake handle need be depressed only one half of the distance normally required.